Study on the form of transient electromagnetic loop source versus the distortion characteristics of the primary field
-
摘要: 近年来，地面瞬变电磁法在矿产资源、水文地质勘查等领域均取得了良好的勘探效果，而当地表条件较差时，探测结果的可靠性明显降低。究其原因，矩形回线源的布设随地形起伏致使形态变化是重要影响因素之一。根据毕奥—萨法尔定律，对通电矩形回线在空间任意点所产生磁场进行计算。通过对比、分析水平矩形回线源和起伏矩形回线源一次场地下介质不同深度三分量的分布特征，总结得出起伏回线源一次场的畸变与源的形态有明显的相关性，其特征表现为浅部畸变程度严重，随着深度的增加畸变程度明显减弱，以上研究为瞬变电磁法探测中地形影响的认识和校正工作提供了理论指导。Abstract: In recent years, the ground transient electromagnetic method has achieved good results in the field of mineral resources, hydrogeological exploration and other fields, and the reliability of the detection results decreases obviously when the surface condition is not good. One of the influencing factors is that the layout of rectangle loop with topographic relief makes its shape change. According to Biot-shaffar law, the magnetic field induced by electrified rectangular loop at any point in space is calculated. Through comparison and analysis of the distribution characteristics of three components of primary field of horizontal and undulating loop sources in subsurface media at different depth, it is concluded that the distortion of the primary field of the undulating loop source is obviously related to the shape of the source, its features are shown as serious distortion at shallow part, with increase of depth, the distortion weakens evidently. The above research provides theoretical guidance for understanding and correction of the topographic effects in transient electromagnetic exploration.
-
-
[1] 肖怀宇. 带地形的瞬变电磁法三维数值模拟[D]. 北京:中国地质大学,2006. [2] 解海军. 煤矿积水采空区瞬变电磁法探测技术研究[D]. 北京:中国地质大学,2009. [3] 唐新功,胡文宝,严良俊. 瞬变电磁法对存在山谷地形时的多个异常体的探测能力研究[J]. 地震地质,2005,27(2):316-323. TANG Xingong,HU Wenbao,YAN Liangjun. The detectability of transient electromagnetic method to multiple 3D bodies with valley topography[J]. Seismology and Geology, 2005,27(2):316-323.
[4] 陈健. 复杂条件下瞬变电磁法探测采空区技术应用[J]. 陕西煤炭,2015,34(2):96-98. CHEN Jian. Research on mine goaf detecting by TEM in complex terrain conditions[J]. Shaanxi Coal, 2015,34(2):96-98.
[5] 王巍,韩吉民,陈剑杰. 起伏地形下隐伏异常体瞬变电磁法探测的模拟实验研究[J]. 工程地质学报,2008,16(4):584-589. WANG Wei, HAN Jimin, CHEN Jianjie. Research on model experiment searchon of transient electromagnetic method to detect deep underground cavities in complex terrain[J]. Journal of Engineering Geology, 2008, 16(4):584-589.
[6] 李建慧,刘树才,李富. 大定源瞬变电磁法矩形发射回线激发的电磁场[J]. 物探化探计算技术,2008,30(2):154-157. LI Jianhui, LIU Shucai, LI Fu. Electromagnetic field induced by the transient electromagnetic method of large source transient electromagnetic method[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2008, 30(2):154-157.
[7] 翁爱华,李舟波,王雪秋. 地表大回线源在任意层状介质中产生磁场的计算[J]. 物探化探计算技术,2000,22(3):245-249. WENG Aihua, LI Zhoubo, WANG Xueqiu. The magnetic field computation for large loop source[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2000, 22(3):245-249.
[8] 李貅. 瞬变电磁测深的理论与应用[M]. 西安:陕西科学技术出版社,2002. [9] 薛国强. 大回线源瞬变电磁场响应特性[J]. 石油地球物理勘探,2007,42(5):586-590. XUE Guoqiang. Response characteristics of large loop source transient electromagnetic field[J]. Oil Geophysical Prospecting, 2007, 42(5):586-590.
[10] 付林兴,邓志武. 毕奥-萨伐尔定律的推导[J]. 湘潭师范学院学报(自然科学版),2006,28(1):28-29. FU Linxing. DENG Zhiwu. Derivation of Biot Savart law[J]. Journal of Xiangtan Normal University(Natural Science Edition), 2006, 28(1):28-29.
[11] 李巍,王信文. 瞬变电磁法探测复杂地形不积水采空区的应用[J]. CT理论与应用研究,2013,22(3):455-462. LI Wei, WANG Xinwen. Application of TEM on detecting goaf of coal mine without water in complex terrains[J]. CT Theory and Applications,2013,22(3):455-462.
[12] 蒋勤涛. 复杂地形地质条件下老空水瞬变电磁探测技术研究[J]. 矿业安全与环保,2014,41(2):57-60. JIANG Qintao. Study on the transient electromagnetic detection technology for Gob water under complex terrain and geological conditions[J]. Mining Safety and Environmental Protection, 2014,41(2):57-60.
[13] 张振勇. TEM技术在岩层富水性探测中的应用[J]. 煤田地质与勘探,2015, 43(6):109-113. ZHANG Zhenyong. Application of TEM technique in detecting the water enrichment of strata[J]. Coal Geology & Exploration, 2015, 43(6):109-113.
[14] 程建远,聂爱兰,张鹏. 煤炭物探技术的主要进展及发展趋势[J]. 煤田地质与勘探,2016, 44(6):136-141. CHENG Jianyuan, NIE Ailan, ZHANG Peng. Outstanding progress and development trend of coal geophysics[J]. Coal Geology & Exploration, 2016, 44(6):136-141.
[15] 薛国强,闫述,陈卫营. 电磁测深数据地形影响的快速校正[J]. 地球物理学报,2016,59(12):4408-4413. XUE Guoqiang, YAN Shu, CHEN Weiying. A fast topographic correction method for electromagnetic data[J]. Earth Physics Journal, 2016, 59(12):4408-4413.
计量
- 文章访问数: 58
- HTML全文浏览量: 17
- PDF下载量: 10
下载:
